Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1452

June 30, 201131 counties in Colorado; 4 counties in Nebraska; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2011, 1:49 PM MDT for 31 counties in Colorado; 4 counties in Nebraska; 4 counties in Wyoming. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2011, 1:49 PM MDT (19:49 UTC)
Expired: Jun 30, 2011, 3:45 PM MDT
In force: 116 min
Issued by: the Storm Prediction Center

All 39 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Delta County, CO, Denver County, CO, Dolores County, CO, Douglas County, CO, Eagle County, CO, Garfield County, CO, Gilpin County, CO, Grand County, CO, Gunnison County, CO, Jackson County, CO, Jefferson County, CO, Lake County, CO, Larimer County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Morgan County, CO, Ouray County, CO, Park County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO, San Miguel County, CO, Summit County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Denver radar (KFTG), 151 km from the middle of the area, began a volume at 19:48 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 7.8 hours before the alert went out and 197 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 28 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 2557 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 8:51 AM MDT	Mesoscale Discussion	SPC	Delta, Dolores, Eagle, Garfield, Gunnison, Hinsdale and 10 more	54 min
Jun 30, 9:06 AM MDT	Severe Thunderstorm Watch	SPC	Delta, Dolores, Eagle, Garfield, Gunnison, La Plata and 10 more	7 hr
Jun 30, 11:57 AM MDT	Mesoscale Discussion	SPC	Adams, Boulder, Broomfield, Chaffee, Clear Creek, Denver and 14 more	63 min
Jun 30, 12:18 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Chaffee, Clear Creek and 17 more	9 hr
Jun 30, 4:17 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Chaffee, Clear Creek and 25 more	118 min
Jun 30, 2:19 PM MDT	Mesoscale Discussion	SPC	Arthur, Cherry, Grant, Hooker, Keith, McPherson and 1 more	56 min
Jun 30, 4:39 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Brown, Cherry, Deuel, Garden, Grant and 9 more	5 hr

Nearby

Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Wyoming, 2011 Every mesoscale discussion in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.